Cao Zhanping, Yan Li, Duan Xinyue, Li Zhengran, Wang Xingyue
College of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China.
College of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China.
Bioresour Technol. 2025 Sep;431:132628. doi: 10.1016/j.biortech.2025.132628. Epub 2025 May 5.
This paper developed a single-chamber α-MnO-coupled microbial electrolysis cell (α-MnO-MEC) system to enhance the oxidation denitrification rate of ammonia nitrogen (NH-N) in order to overcome the electrode repulsion problem between NH and the anode. The α-MnO material with an equilibrium adsorption capacity of 10.6 mg·g for NH-N was developed. The removal rate of total nitrogen in the α-MnO-MEC reactor is 95.8 %, and NH oxidation efficiency is 100 % in 20 h, which is 78.7 % and 47.8 % higher than in the α-MnO reactor and the MEC reactor, respectively. The Mn(II)/α-MnO cycle was realized in α-MnO-MEC reactor, avoiding the loss of the Mn(II). The 16S rRNA gene sequencing identified key microbial genera involved in the ammonia removal are Candidatus_Brocadia, SC-I-84, and Thauera. This study demonstrates that combining α-MnO with bioelectrochemistry provides a novel strategy for ammonia nitrogen wastewater treatment, offering a new insight for optimizing electrochemical-microbial coupled nitrogen removal.
本文开发了一种单室α-二氧化锰耦合微生物电解池（α-MnO-MEC）系统，以提高氨氮（NH-N）的氧化脱氮率，从而克服NH与阳极之间的电极排斥问题。开发了对NH-N平衡吸附容量为10.6 mg·g的α-二氧化锰材料。α-MnO-MEC反应器中总氮的去除率为95.8%，NH氧化效率在20小时内达到100%，分别比α-MnO反应器和MEC反应器高78.7%和47.8%。在α-MnO-MEC反应器中实现了Mn（II）/α-MnO循环，避免了Mn（II）的损失。16S rRNA基因测序确定参与氨去除的关键微生物属为Candidatus_Brocadia、SC-I-84和Thauera。本研究表明，将α-二氧化锰与生物电化学相结合为氨氮废水处理提供了一种新策略，为优化电化学-微生物耦合脱氮提供了新的见解。
